Finding the Third Proportional to 129,502 and 200,005

Step by Step Solution

1. Step 1: Write the proportion equation
   129,502 : 200,005 = 200,005 : x
2. Step 2: Convert to fraction form
   129,502/200,005 = 200,005/x
3. Step 3: Cross multiply
   129,502x = 200,005 × 200,005
4. Step 4: Simplify right side
   129,502x = 40,002,000,025
5. Step 5: Solve for x
   x = 40,002,000,025/129,502
6. Step 6: Final answer
   x = 308,890.98